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Last edited 17 Oct 2018
A porch is a covered, single-storey structure that can be enclosed, and projects out from a house or other building. It is a particularly popular option for extending a domestic building, typically at the front entrance, where it can provide additional space, allow the creation of a draft lobby and create an architectural focus. It can also be relatively inexpensive to construct.
Generally, a porch consists simply of low-level brick dwarf walls, columns, windows and a door. It will require foundations, and the junctions between the walls of the porch and those of the existing building will need to be properly sealed.
Due to their relatively small size, a porch may not require planning permission (although they may in a conservation area or for a listed building, so it is best to check with the local planning authority). Building regulations approval may also be required if the porch is not separated from the house by an internal door and is heated, or if there are structural, accessibility or drainage implications (again, it is best to check with the building control department of the local authority).
There are several different types of porch and it depends to a considerable extent on the existing front entrance as to which is the most suitable. For example, a plain front (as is common with terraced houses) will typically only be suitable for a mounted canopy above the door; a recessed front door (as is common with Victorian and Edwardian houses) will require the recess being blocked in with brickwork and/or glass. Buildings with existing entrance canopies may be capable of being infilled with timber, brick and/or glass, although care should be taken to install a damp-proof course (DPC).
When choosing or designing a porch it is important to make sure that it suits the existing building. Typically this will involve using the same materials, although in some cases, contrast with the existing building can be appropriate. Often, the existing front door can be moved to the exterior face of the porch (if it is suitable), with a new interior door installed between the building and the porch to create a draft lobby.
In terms of budgeting the building of a porch, some of the important factors to consider include:
- Its size.
- The amount of work required to the existing building.
- Whether it will be fully enclosed or not.
- Whether it will be partially or fully glazed on all sides.
- The type of roof – flat or sloping.
- The type of cladding or external brickwork to be used.
 Related articles on Designing Buildings Wiki
- Avoiding planning permission pitfalls.
- Basements in buildings.
- Building an extension.
- Dwarf wall.
- External doors.
- Hiring an architect as a domestic client.
- How to build a garage.
- How to find a builder.
- Licence to alter.
- Loft conversion.
- Planning permission.
- Wrought iron porch.
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